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Hi there! 1) It is best to change the phrase altogether and use this instead: 'After all those years, you look exactly the same'. The key here is to remove the verb 'are' which is incorrect in this context, and replace it with the verb 'look'. Now, we do not say 'in the old times': the correct phrase is 'in the old days' (= in the past). 2) 'Mess' is USUALLY found in singular, not in plural. And you can either say 'in plural', or 'in the plural form'. Now, "Don't get me into your messes" is incorrect. Use 'Don't make me take part in all this mess of yours' (with the word 'all' we get this idea that the mess is big). Also, "another of your messes" needs to be changed into a verb: 'Are you messing up (the room) again?' ('again' is close to 'another' here).

Depending on the context I would say "you are the same as the old days", this is very much personal though, I am not sure it is grammatically correct and I am sure other people will say it different. I would always use mess as a single and plural word.. It doesn't really matter if it is one mess or two, I would still imply that it is someone's mess, whether single or plural.